1 files changed, 888 insertions, 0 deletions

diff --git a/drivers/pinctrl/pinctrl-samsung.c b/drivers/pinctrl/pinctrl-samsung.c
new file mode 100644
index 000000000000..8a24223d5334
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-samsung.c
@@ -0,0 +1,888 @@
+/*
+ * pin-controller/pin-mux/pin-config/gpio-driver for Samsung's SoC's.
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com
+ * Copyright (c) 2012 Linaro Ltd
+ *              http://www.linaro.org
+ *
+ * Author: Thomas Abraham <thomas.ab@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This driver implements the Samsung pinctrl driver. It supports setting up of
+ * pinmux and pinconf configurations. The gpiolib interface is also included.
+ * External interrupt (gpio and wakeup) support are not included in this driver
+ * but provides extensions to which platform specific implementation of the gpio
+ * and wakeup interrupts can be hooked to.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+
+#include "core.h"
+#include "pinctrl-samsung.h"
+
+#define GROUP_SUFFIX            "-grp"
+#define GSUFFIX_LEN             sizeof(GROUP_SUFFIX)
+#define FUNCTION_SUFFIX         "-mux"
+#define FSUFFIX_LEN             sizeof(FUNCTION_SUFFIX)
+
+/* list of all possible config options supported */
+struct pin_config {
+        char            *prop_cfg;
+        unsigned int    cfg_type;
+} pcfgs[] = {
+        { "samsung,pin-pud", PINCFG_TYPE_PUD },
+        { "samsung,pin-drv", PINCFG_TYPE_DRV },
+        { "samsung,pin-con-pdn", PINCFG_TYPE_CON_PDN },
+        { "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN },
+};
+
+/* check if the selector is a valid pin group selector */
+static int samsung_get_group_count(struct pinctrl_dev *pctldev)
+{
+        struct samsung_pinctrl_drv_data *drvdata;
+
+        drvdata = pinctrl_dev_get_drvdata(pctldev);
+        return drvdata->nr_groups;
+}
+
+/* return the name of the group selected by the group selector */
+static const char *samsung_get_group_name(struct pinctrl_dev *pctldev,
+                                                unsigned selector)
+{
+        struct samsung_pinctrl_drv_data *drvdata;
+
+        drvdata = pinctrl_dev_get_drvdata(pctldev);
+        return drvdata->pin_groups[selector].name;
+}
+
+/* return the pin numbers associated with the specified group */
+static int samsung_get_group_pins(struct pinctrl_dev *pctldev,
+                unsigned selector, const unsigned **pins, unsigned *num_pins)
+{
+        struct samsung_pinctrl_drv_data *drvdata;
+
+        drvdata = pinctrl_dev_get_drvdata(pctldev);
+        *pins = drvdata->pin_groups[selector].pins;
+        *num_pins = drvdata->pin_groups[selector].num_pins;
+        return 0;
+}
+
+/* create pinctrl_map entries by parsing device tree nodes */
+static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
+                        struct device_node *np, struct pinctrl_map **maps,
+                        unsigned *nmaps)
+{
+        struct device *dev = pctldev->dev;
+        struct pinctrl_map *map;
+        unsigned long *cfg = NULL;
+        char *gname, *fname;
+        int cfg_cnt = 0, map_cnt = 0, idx = 0;
+
+        /* count the number of config options specfied in the node */
+        for (idx = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
+                if (of_find_property(np, pcfgs[idx].prop_cfg, NULL))
+                        cfg_cnt++;
+        }
+
+        /*
+         * Find out the number of map entries to create. All the config options
+         * can be accomadated into a single config map entry.
+         */
+        if (cfg_cnt)
+                map_cnt = 1;
+        if (of_find_property(np, "samsung,pin-function", NULL))
+                map_cnt++;
+        if (!map_cnt) {
+                dev_err(dev, "node %s does not have either config or function "
+                                "configurations\n", np->name);
+                return -EINVAL;
+        }
+
+        /* Allocate memory for pin-map entries */
+        map = kzalloc(sizeof(*map) * map_cnt, GFP_KERNEL);
+        if (!map) {
+                dev_err(dev, "could not alloc memory for pin-maps\n");
+                return -ENOMEM;
+        }
+        *nmaps = 0;
+
+        /*
+         * Allocate memory for pin group name. The pin group name is derived
+         * from the node name from which these map entries are be created.
+         */
+        gname = kzalloc(strlen(np->name) + GSUFFIX_LEN, GFP_KERNEL);
+        if (!gname) {
+                dev_err(dev, "failed to alloc memory for group name\n");
+                goto free_map;
+        }
+        sprintf(gname, "%s%s", np->name, GROUP_SUFFIX);
+
+        /*
+         * don't have config options? then skip over to creating function
+         * map entries.
+         */
+        if (!cfg_cnt)
+                goto skip_cfgs;
+
+        /* Allocate memory for config entries */
+        cfg = kzalloc(sizeof(*cfg) * cfg_cnt, GFP_KERNEL);
+        if (!cfg) {
+                dev_err(dev, "failed to alloc memory for configs\n");
+                goto free_gname;
+        }
+
+        /* Prepare a list of config settings */
+        for (idx = 0, cfg_cnt = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
+                u32 value;
+                if (!of_property_read_u32(np, pcfgs[idx].prop_cfg, &value))
+                        cfg[cfg_cnt++] =
+                                PINCFG_PACK(pcfgs[idx].cfg_type, value);
+        }
+
+        /* create the config map entry */
+        map[*nmaps].data.configs.group_or_pin = gname;
+        map[*nmaps].data.configs.configs = cfg;
+        map[*nmaps].data.configs.num_configs = cfg_cnt;
+        map[*nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
+        *nmaps += 1;
+
+skip_cfgs:
+        /* create the function map entry */
+        if (of_find_property(np, "samsung,pin-function", NULL)) {
+                fname = kzalloc(strlen(np->name) + FSUFFIX_LEN, GFP_KERNEL);
+                if (!fname) {
+                        dev_err(dev, "failed to alloc memory for func name\n");
+                        goto free_cfg;
+                }
+                sprintf(fname, "%s%s", np->name, FUNCTION_SUFFIX);
+
+                map[*nmaps].data.mux.group = gname;
+                map[*nmaps].data.mux.function = fname;
+                map[*nmaps].type = PIN_MAP_TYPE_MUX_GROUP;
+                *nmaps += 1;
+        }
+
+        *maps = map;
+        return 0;
+
+free_cfg:
+        kfree(cfg);
+free_gname:
+        kfree(gname);
+free_map:
+        kfree(map);
+        return -ENOMEM;
+}
+
+/* free the memory allocated to hold the pin-map table */
+static void samsung_dt_free_map(struct pinctrl_dev *pctldev,
+                             struct pinctrl_map *map, unsigned num_maps)
+{
+        int idx;
+
+        for (idx = 0; idx < num_maps; idx++) {
+                if (map[idx].type == PIN_MAP_TYPE_MUX_GROUP) {
+                        kfree(map[idx].data.mux.function);
+                        if (!idx)
+                                kfree(map[idx].data.mux.group);
+                } else if (map->type == PIN_MAP_TYPE_CONFIGS_GROUP) {
+                        kfree(map[idx].data.configs.configs);
+                        if (!idx)
+                                kfree(map[idx].data.configs.group_or_pin);
+                }
+        };
+
+        kfree(map);
+}
+
+/* list of pinctrl callbacks for the pinctrl core */
+static struct pinctrl_ops samsung_pctrl_ops = {
+        .get_groups_count       = samsung_get_group_count,
+        .get_group_name         = samsung_get_group_name,
+        .get_group_pins         = samsung_get_group_pins,
+        .dt_node_to_map         = samsung_dt_node_to_map,
+        .dt_free_map            = samsung_dt_free_map,
+};
+
+/* check if the selector is a valid pin function selector */
+static int samsung_get_functions_count(struct pinctrl_dev *pctldev)
+{
+        struct samsung_pinctrl_drv_data *drvdata;
+
+        drvdata = pinctrl_dev_get_drvdata(pctldev);
+        return drvdata->nr_functions;
+}
+
+/* return the name of the pin function specified */
+static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev,
+                                                unsigned selector)
+{
+        struct samsung_pinctrl_drv_data *drvdata;
+
+        drvdata = pinctrl_dev_get_drvdata(pctldev);
+        return drvdata->pmx_functions[selector].name;
+}
+
+/* return the groups associated for the specified function selector */
+static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev,
+                unsigned selector, const char * const **groups,
+                unsigned * const num_groups)
+{
+        struct samsung_pinctrl_drv_data *drvdata;
+
+        drvdata = pinctrl_dev_get_drvdata(pctldev);
+        *groups = drvdata->pmx_functions[selector].groups;
+        *num_groups = drvdata->pmx_functions[selector].num_groups;
+        return 0;
+}
+
+/*
+ * given a pin number that is local to a pin controller, find out the pin bank
+ * and the register base of the pin bank.
+ */
+static void pin_to_reg_bank(struct gpio_chip *gc, unsigned pin,
+                        void __iomem **reg, u32 *offset,
+                        struct samsung_pin_bank **bank)
+{
+        struct samsung_pinctrl_drv_data *drvdata;
+        struct samsung_pin_bank *b;
+
+        drvdata = dev_get_drvdata(gc->dev);
+        b = drvdata->ctrl->pin_banks;
+
+        while ((pin >= b->pin_base) &&
+                        ((b->pin_base + b->nr_pins - 1) < pin))
+                b++;
+
+        *reg = drvdata->virt_base + b->pctl_offset;
+        *offset = pin - b->pin_base;
+        if (bank)
+                *bank = b;
+
+        /* some banks have two config registers in a single bank */
+        if (*offset * b->func_width > BITS_PER_LONG)
+                *reg += 4;
+}
+
+/* enable or disable a pinmux function */
+static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
+                                        unsigned group, bool enable)
+{
+        struct samsung_pinctrl_drv_data *drvdata;
+        const unsigned int *pins;
+        struct samsung_pin_bank *bank;
+        void __iomem *reg;
+        u32 mask, shift, data, pin_offset, cnt;
+
+        drvdata = pinctrl_dev_get_drvdata(pctldev);
+        pins = drvdata->pin_groups[group].pins;
+
+        /*
+         * for each pin in the pin group selected, program the correspoding pin
+         * pin function number in the config register.
+         */
+        for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) {
+                pin_to_reg_bank(drvdata->gc, pins[cnt] - drvdata->ctrl->base,
+                                &reg, &pin_offset, &bank);
+                mask = (1 << bank->func_width) - 1;
+                shift = pin_offset * bank->func_width;
+
+                data = readl(reg);
+                data &= ~(mask << shift);
+                if (enable)
+                        data |= drvdata->pin_groups[group].func << shift;
+                writel(data, reg);
+        }
+}
+
+/* enable a specified pinmux by writing to registers */
+static int samsung_pinmux_enable(struct pinctrl_dev *pctldev, unsigned selector,
+                                        unsigned group)
+{
+        samsung_pinmux_setup(pctldev, selector, group, true);
+        return 0;
+}
+
+/* disable a specified pinmux by writing to registers */
+static void samsung_pinmux_disable(struct pinctrl_dev *pctldev,
+                                        unsigned selector, unsigned group)
+{
+        samsung_pinmux_setup(pctldev, selector, group, false);
+}
+
+/*
+ * The calls to gpio_direction_output() and gpio_direction_input()
+ * leads to this function call (via the pinctrl_gpio_direction_{input|output}()
+ * function called from the gpiolib interface).
+ */
+static int samsung_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
+                struct pinctrl_gpio_range *range, unsigned offset, bool input)
+{
+        struct samsung_pin_bank *bank;
+        void __iomem *reg;
+        u32 data, pin_offset, mask, shift;
+
+        pin_to_reg_bank(range->gc, offset, &reg, &pin_offset, &bank);
+        mask = (1 << bank->func_width) - 1;
+        shift = pin_offset * bank->func_width;
+
+        data = readl(reg);
+        data &= ~(mask << shift);
+        if (!input)
+                data |= FUNC_OUTPUT << shift;
+        writel(data, reg);
+        return 0;
+}
+
+/* list of pinmux callbacks for the pinmux vertical in pinctrl core */
+static struct pinmux_ops samsung_pinmux_ops = {
+        .get_functions_count    = samsung_get_functions_count,
+        .get_function_name      = samsung_pinmux_get_fname,
+        .get_function_groups    = samsung_pinmux_get_groups,
+        .enable                 = samsung_pinmux_enable,
+        .disable                = samsung_pinmux_disable,
+        .gpio_set_direction     = samsung_pinmux_gpio_set_direction,
+};
+
+/* set or get the pin config settings for a specified pin */
+static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
+                                unsigned long *config, bool set)
+{
+        struct samsung_pinctrl_drv_data *drvdata;
+        struct samsung_pin_bank *bank;
+        void __iomem *reg_base;
+        enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
+        u32 data, width, pin_offset, mask, shift;
+        u32 cfg_value, cfg_reg;
+
+        drvdata = pinctrl_dev_get_drvdata(pctldev);
+        pin_to_reg_bank(drvdata->gc, pin - drvdata->ctrl->base, &reg_base,
+                                        &pin_offset, &bank);
+
+        switch (cfg_type) {
+        case PINCFG_TYPE_PUD:
+                width = bank->pud_width;
+                cfg_reg = PUD_REG;
+                break;
+        case PINCFG_TYPE_DRV:
+                width = bank->drv_width;
+                cfg_reg = DRV_REG;
+                break;
+        case PINCFG_TYPE_CON_PDN:
+                width = bank->conpdn_width;
+                cfg_reg = CONPDN_REG;
+                break;
+        case PINCFG_TYPE_PUD_PDN:
+                width = bank->pudpdn_width;
+                cfg_reg = PUDPDN_REG;
+                break;
+        default:
+                WARN_ON(1);
+                return -EINVAL;
+        }
+
+        mask = (1 << width) - 1;
+        shift = pin_offset * width;
+        data = readl(reg_base + cfg_reg);
+
+        if (set) {
+                cfg_value = PINCFG_UNPACK_VALUE(*config);
+                data &= ~(mask << shift);
+                data |= (cfg_value << shift);
+                writel(data, reg_base + cfg_reg);
+        } else {
+                data >>= shift;
+                data &= mask;
+                *config = PINCFG_PACK(cfg_type, data);
+        }
+        return 0;
+}
+
+/* set the pin config settings for a specified pin */
+static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
+                                unsigned long config)
+{
+        return samsung_pinconf_rw(pctldev, pin, &config, true);
+}
+
+/* get the pin config settings for a specified pin */
+static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
+                                        unsigned long *config)
+{
+        return samsung_pinconf_rw(pctldev, pin, config, false);
+}
+
+/* set the pin config settings for a specified pin group */
+static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev,
+                        unsigned group, unsigned long config)
+{
+        struct samsung_pinctrl_drv_data *drvdata;
+        const unsigned int *pins;
+        unsigned int cnt;
+
+        drvdata = pinctrl_dev_get_drvdata(pctldev);
+        pins = drvdata->pin_groups[group].pins;
+
+        for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++)
+                samsung_pinconf_set(pctldev, pins[cnt], config);
+
+        return 0;
+}
+
+/* get the pin config settings for a specified pin group */
+static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev,
+                                unsigned int group, unsigned long *config)
+{
+        struct samsung_pinctrl_drv_data *drvdata;
+        const unsigned int *pins;
+
+        drvdata = pinctrl_dev_get_drvdata(pctldev);
+        pins = drvdata->pin_groups[group].pins;
+        samsung_pinconf_get(pctldev, pins[0], config);
+        return 0;
+}
+
+/* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
+static struct pinconf_ops samsung_pinconf_ops = {
+        .pin_config_get         = samsung_pinconf_get,
+        .pin_config_set         = samsung_pinconf_set,
+        .pin_config_group_get   = samsung_pinconf_group_get,
+        .pin_config_group_set   = samsung_pinconf_group_set,
+};
+
+/* gpiolib gpio_set callback function */
+static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
+{
+        void __iomem *reg;
+        u32 pin_offset, data;
+
+        pin_to_reg_bank(gc, offset, &reg, &pin_offset, NULL);
+        data = readl(reg + DAT_REG);
+        data &= ~(1 << pin_offset);
+        if (value)
+                data |= 1 << pin_offset;
+        writel(data, reg + DAT_REG);
+}
+
+/* gpiolib gpio_get callback function */
+static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+        void __iomem *reg;
+        u32 pin_offset, data;
+
+        pin_to_reg_bank(gc, offset, &reg, &pin_offset, NULL);
+        data = readl(reg + DAT_REG);
+        data >>= pin_offset;
+        data &= 1;
+        return data;
+}
+
+/*
+ * gpiolib gpio_direction_input callback function. The setting of the pin
+ * mux function as 'gpio input' will be handled by the pinctrl susbsystem
+ * interface.
+ */
+static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
+{
+        return pinctrl_gpio_direction_input(gc->base + offset);
+}
+
+/*
+ * gpiolib gpio_direction_output callback function. The setting of the pin
+ * mux function as 'gpio output' will be handled by the pinctrl susbsystem
+ * interface.
+ */
+static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
+                                                        int value)
+{
+        samsung_gpio_set(gc, offset, value);
+        return pinctrl_gpio_direction_output(gc->base + offset);
+}
+
+/*
+ * Parse the pin names listed in the 'samsung,pins' property and convert it
+ * into a list of gpio numbers are create a pin group from it.
+ */
+static int __init samsung_pinctrl_parse_dt_pins(struct platform_device *pdev,
+                        struct device_node *cfg_np, struct pinctrl_desc *pctl,
+                        unsigned int **pin_list, unsigned int *npins)
+{
+        struct device *dev = &pdev->dev;
+        struct property *prop;
+        struct pinctrl_pin_desc const *pdesc = pctl->pins;
+        unsigned int idx = 0, cnt;
+        const char *pin_name;
+
+        *npins = of_property_count_strings(cfg_np, "samsung,pins");
+        if (*npins < 0) {
+                dev_err(dev, "invalid pin list in %s node", cfg_np->name);
+                return -EINVAL;
+        }
+
+        *pin_list = devm_kzalloc(dev, *npins * sizeof(**pin_list), GFP_KERNEL);
+        if (!*pin_list) {
+                dev_err(dev, "failed to allocate memory for pin list\n");
+                return -ENOMEM;
+        }
+
+        of_property_for_each_string(cfg_np, "samsung,pins", prop, pin_name) {
+                for (cnt = 0; cnt < pctl->npins; cnt++) {
+                        if (pdesc[cnt].name) {
+                                if (!strcmp(pin_name, pdesc[cnt].name)) {
+                                        (*pin_list)[idx++] = pdesc[cnt].number;
+                                        break;
+                                }
+                        }
+                }
+                if (cnt == pctl->npins) {
+                        dev_err(dev, "pin %s not valid in %s node\n",
+                                        pin_name, cfg_np->name);
+                        devm_kfree(dev, *pin_list);
+                        return -EINVAL;
+                }
+        }
+
+        return 0;
+}
+
+/*
+ * Parse the information about all the available pin groups and pin functions
+ * from device node of the pin-controller. A pin group is formed with all
+ * the pins listed in the "samsung,pins" property.
+ */
+static int __init samsung_pinctrl_parse_dt(struct platform_device *pdev,
+                                struct samsung_pinctrl_drv_data *drvdata)
+{
+        struct device *dev = &pdev->dev;
+        struct device_node *dev_np = dev->of_node;
+        struct device_node *cfg_np;
+        struct samsung_pin_group *groups, *grp;
+        struct samsung_pmx_func *functions, *func;
+        unsigned *pin_list;
+        unsigned int npins, grp_cnt, func_idx = 0;
+        char *gname, *fname;
+        int ret;
+
+        grp_cnt = of_get_child_count(dev_np);
+        if (!grp_cnt)
+                return -EINVAL;
+
+        groups = devm_kzalloc(dev, grp_cnt * sizeof(*groups), GFP_KERNEL);
+        if (!groups) {
+                dev_err(dev, "failed allocate memory for ping group list\n");
+                return -EINVAL;
+        }
+        grp = groups;
+
+        functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL);
+        if (!functions) {
+                dev_err(dev, "failed to allocate memory for function list\n");
+                return -EINVAL;
+        }
+        func = functions;
+
+        /*
+         * Iterate over all the child nodes of the pin controller node
+         * and create pin groups and pin function lists.
+         */
+        for_each_child_of_node(dev_np, cfg_np) {
+                u32 function;
+                if (of_find_property(cfg_np, "interrupt-controller", NULL))
+                        continue;
+
+                ret = samsung_pinctrl_parse_dt_pins(pdev, cfg_np,
+                                        &drvdata->pctl, &pin_list, &npins);
+                if (ret)
+                        return ret;
+
+                /* derive pin group name from the node name */
+                gname = devm_kzalloc(dev, strlen(cfg_np->name) + GSUFFIX_LEN,
+                                        GFP_KERNEL);
+                if (!gname) {
+                        dev_err(dev, "failed to alloc memory for group name\n");
+                        return -ENOMEM;
+                }
+                sprintf(gname, "%s%s", cfg_np->name, GROUP_SUFFIX);
+
+                grp->name = gname;
+                grp->pins = pin_list;
+                grp->num_pins = npins;
+                of_property_read_u32(cfg_np, "samsung,pin-function", &function);
+                grp->func = function;
+                grp++;
+
+                if (!of_find_property(cfg_np, "samsung,pin-function", NULL))
+                        continue;
+
+                /* derive function name from the node name */
+                fname = devm_kzalloc(dev, strlen(cfg_np->name) + FSUFFIX_LEN,
+                                        GFP_KERNEL);
+                if (!fname) {
+                        dev_err(dev, "failed to alloc memory for func name\n");
+                        return -ENOMEM;
+                }
+                sprintf(fname, "%s%s", cfg_np->name, FUNCTION_SUFFIX);
+
+                func->name = fname;
+                func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL);
+                if (!func->groups) {
+                        dev_err(dev, "failed to alloc memory for group list "
+                                        "in pin function");
+                        return -ENOMEM;
+                }
+                func->groups[0] = gname;
+                func->num_groups = 1;
+                func++;
+                func_idx++;
+        }
+
+        drvdata->pin_groups = groups;
+        drvdata->nr_groups = grp_cnt;
+        drvdata->pmx_functions = functions;
+        drvdata->nr_functions = func_idx;
+
+        return 0;
+}
+
+/* register the pinctrl interface with the pinctrl subsystem */
+static int __init samsung_pinctrl_register(struct platform_device *pdev,
+                                struct samsung_pinctrl_drv_data *drvdata)
+{
+        struct pinctrl_desc *ctrldesc = &drvdata->pctl;
+        struct pinctrl_pin_desc *pindesc, *pdesc;
+        struct samsung_pin_bank *pin_bank;
+        char *pin_names;
+        int pin, bank, ret;
+
+        ctrldesc->name = "samsung-pinctrl";
+        ctrldesc->owner = THIS_MODULE;
+        ctrldesc->pctlops = &samsung_pctrl_ops;
+        ctrldesc->pmxops = &samsung_pinmux_ops;
+        ctrldesc->confops = &samsung_pinconf_ops;
+
+        pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
+                        drvdata->ctrl->nr_pins, GFP_KERNEL);
+        if (!pindesc) {
+                dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n");
+                return -ENOMEM;
+        }
+        ctrldesc->pins = pindesc;
+        ctrldesc->npins = drvdata->ctrl->nr_pins;
+        ctrldesc->npins = drvdata->ctrl->nr_pins;
+
+        /* dynamically populate the pin number and pin name for pindesc */
+        for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
+                pdesc->number = pin + drvdata->ctrl->base;
+
+        /*
+         * allocate space for storing the dynamically generated names for all
+         * the pins which belong to this pin-controller.
+         */
+        pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH *
+                                        drvdata->ctrl->nr_pins, GFP_KERNEL);
+        if (!pin_names) {
+                dev_err(&pdev->dev, "mem alloc for pin names failed\n");
+                return -ENOMEM;
+        }
+
+        /* for each pin, the name of the pin is pin-bank name + pin number */
+        for (bank = 0; bank < drvdata->ctrl->nr_banks; bank++) {
+                pin_bank = &drvdata->ctrl->pin_banks[bank];
+                for (pin = 0; pin < pin_bank->nr_pins; pin++) {
+                        sprintf(pin_names, "%s-%d", pin_bank->name, pin);
+                        pdesc = pindesc + pin_bank->pin_base + pin;
+                        pdesc->name = pin_names;
+                        pin_names += PIN_NAME_LENGTH;
+                }
+        }
+
+        drvdata->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, drvdata);
+        if (!drvdata->pctl_dev) {
+                dev_err(&pdev->dev, "could not register pinctrl driver\n");
+                return -EINVAL;
+        }
+
+        drvdata->grange.name = "samsung-pctrl-gpio-range";
+        drvdata->grange.id = 0;
+        drvdata->grange.base = drvdata->ctrl->base;
+        drvdata->grange.npins = drvdata->ctrl->nr_pins;
+        drvdata->grange.gc = drvdata->gc;
+        pinctrl_add_gpio_range(drvdata->pctl_dev, &drvdata->grange);
+
+        ret = samsung_pinctrl_parse_dt(pdev, drvdata);
+        if (ret) {
+                pinctrl_unregister(drvdata->pctl_dev);
+                return ret;
+        }
+
+        return 0;
+}
+
+/* register the gpiolib interface with the gpiolib subsystem */
+static int __init samsung_gpiolib_register(struct platform_device *pdev,
+                                struct samsung_pinctrl_drv_data *drvdata)
+{
+        struct gpio_chip *gc;
+        int ret;
+
+        gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
+        if (!gc) {
+                dev_err(&pdev->dev, "mem alloc for gpio_chip failed\n");
+                return -ENOMEM;
+        }
+
+        drvdata->gc = gc;
+        gc->base = drvdata->ctrl->base;
+        gc->ngpio = drvdata->ctrl->nr_pins;
+        gc->dev = &pdev->dev;
+        gc->set = samsung_gpio_set;
+        gc->get = samsung_gpio_get;
+        gc->direction_input = samsung_gpio_direction_input;
+        gc->direction_output = samsung_gpio_direction_output;
+        gc->label = drvdata->ctrl->label;
+        gc->owner = THIS_MODULE;
+        ret = gpiochip_add(gc);
+        if (ret) {
+                dev_err(&pdev->dev, "failed to register gpio_chip %s, error "
+                                        "code: %d\n", gc->label, ret);
+                return ret;
+        }
+
+        return 0;
+}
+
+/* unregister the gpiolib interface with the gpiolib subsystem */
+static int __init samsung_gpiolib_unregister(struct platform_device *pdev,
+                                struct samsung_pinctrl_drv_data *drvdata)
+{
+        int ret = gpiochip_remove(drvdata->gc);
+        if (ret) {
+                dev_err(&pdev->dev, "gpio chip remove failed\n");
+                return ret;
+        }
+        return 0;
+}
+
+static const struct of_device_id samsung_pinctrl_dt_match[];
+
+/* retrieve the soc specific data */
+static inline struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data(
+                                struct platform_device *pdev)
+{
+        int id;
+        const struct of_device_id *match;
+        const struct device_node *node = pdev->dev.of_node;
+
+        id = of_alias_get_id(pdev->dev.of_node, "pinctrl");
+        if (id < 0) {
+                dev_err(&pdev->dev, "failed to get alias id\n");
+                return NULL;
+        }
+        match = of_match_node(samsung_pinctrl_dt_match, node);
+        return (struct samsung_pin_ctrl *)match->data + id;
+}
+
+static int __devinit samsung_pinctrl_probe(struct platform_device *pdev)
+{
+        struct samsung_pinctrl_drv_data *drvdata;
+        struct device *dev = &pdev->dev;
+        struct samsung_pin_ctrl *ctrl;
+        struct resource *res;
+        int ret;
+
+        if (!dev->of_node) {
+                dev_err(dev, "device tree node not found\n");
+                return -ENODEV;
+        }
+
+        ctrl = samsung_pinctrl_get_soc_data(pdev);
+        if (!ctrl) {
+                dev_err(&pdev->dev, "driver data not available\n");
+                return -EINVAL;
+        }
+
+        drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
+        if (!drvdata) {
+                dev_err(dev, "failed to allocate memory for driver's "
+                                "private data\n");
+                return -ENOMEM;
+        }
+        drvdata->ctrl = ctrl;
+        drvdata->dev = dev;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(dev, "cannot find IO resource\n");
+                return -ENOENT;
+        }
+
+        drvdata->virt_base = devm_request_and_ioremap(&pdev->dev, res);
+        if (!drvdata->virt_base) {
+                dev_err(dev, "ioremap failed\n");
+                return -ENODEV;
+        }
+
+        res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        if (res)
+                drvdata->irq = res->start;
+
+        ret = samsung_gpiolib_register(pdev, drvdata);
+        if (ret)
+                return ret;
+
+        ret = samsung_pinctrl_register(pdev, drvdata);
+        if (ret) {
+                samsung_gpiolib_unregister(pdev, drvdata);
+                return ret;
+        }
+
+        if (ctrl->eint_gpio_init)
+                ctrl->eint_gpio_init(drvdata);
+        if (ctrl->eint_wkup_init)
+                ctrl->eint_wkup_init(drvdata);
+
+        platform_set_drvdata(pdev, drvdata);
+        return 0;
+}
+
+static const struct of_device_id samsung_pinctrl_dt_match[] = {
+        { .compatible = "samsung,pinctrl-exynos4210",
+                .data = (void *)exynos4210_pin_ctrl },
+        {},
+};
+MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match);
+
+static struct platform_driver samsung_pinctrl_driver = {
+        .probe          = samsung_pinctrl_probe,
+        .driver = {
+                .name   = "samsung-pinctrl",
+                .owner  = THIS_MODULE,
+                .of_match_table = of_match_ptr(samsung_pinctrl_dt_match),
+        },
+};
+
+static int __init samsung_pinctrl_drv_register(void)
+{
+        return platform_driver_register(&samsung_pinctrl_driver);
+}
+postcore_initcall(samsung_pinctrl_drv_register);
+
+static void __exit samsung_pinctrl_drv_unregister(void)
+{
+        platform_driver_unregister(&samsung_pinctrl_driver);
+}
+module_exit(samsung_pinctrl_drv_unregister);
+
+MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
+MODULE_DESCRIPTION("Samsung pinctrl driver");
+MODULE_LICENSE("GPL v2");